Life expectancy for calling birds is 2.4 years. the record for the oldest calling bird's life was 21 years old.

how much older was the oldest bird than the average bird's life?

step-by-step explanation:

just plug in each number for x and see which ones work and don't

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers